// 背景图片
bg-image($url)
  background-image url($url + ".png")
  background-repeat no-repeat
  // @media (-webkit-min-device-pixel-ratio: 3),(min-device-pixel-ratio: 3)
  //   background-image: url($url + "@3x.png")
  //   background-repeat no-repeat


border-bottom-1px($color)
  border-bottom 1px solid $color


border-none() {
  border none
}


extend-click() 
  &:before 
    content ''
    position absolute
    top -10px
    left -10px
    right -10px
    bottom -10px

disabled() 
  &.disabled 
    opacity .6
  
